Edit 1 Have decided probably easier to reinstall W10 from disk, and will do this

Thank you cereberus.
Unfortunately I have already tried my Macrium Reflect disk. I selected W10 and ran the repair, but on Restart only W7 showed.
Both systems show in Disk Management - W10 as a...

I typed in the bcdboot F:\Windows and got the message
"Failure when attempting to copy boot files"

If these are damaged or missing is there a way to correct this?

Edit 1 - should add that...